Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 9: III-V semiconductors (other than nitrides)

HL 9.3: Vortrag

Montag, 12. März 2018, 15:30–15:45, EW 202

Magnetic properties of InP wurtzite nanowires from theory: g-factors and exciton Zeeman splitting — •Paulo E. Faria Junior¹, Davide Tedeschi², Marta De Luca^2,3, Benedikt Scharf^1,4, Antonio Polimeni², and Jaroslav Fabian¹ — ¹University of Regensburg — ²Sapienza Università di Roma — ³University of Basel — ⁴University of Würzburg

Spin-dependent phenomena in III-V wurtzite (WZ) semiconductor nanowires (NWs) have recently attracted great attention. For instance, recent experiments showed that InP WZ NWs exhibit an unconventional and unexplained nonlinear Zeeman splitting (ZS) under high magnetic fields[1,2]. Starting with a robust k.p Hamiltonian[3], we investigate the magnetic properties of InP in the WZ phase, specifically focusing on g-factors and excitonic ZS. Our calculated values of effective g-factors are in excellent agreement with experimental data[1,2] and also show the independent contributions of electron and hole g-factors, typically entangled in experiments due to excitonic effects. Regarding the nonlinear ZS of excitons in large magnetic fields, we showed that the origin for such nonlinearity is the interaction between heavy and light hole bands with spin up from different Landau level indices[2,4]. [1] De Luca et al., Nano Lett. 14, 4250 (2014). [2] Tedeschi et al., in preparation. [3] Faria Junior et al., PRB 93, 235204 (2016). [4] Faria Junior et al., in preparation. Supported by: Alexander von Humboldt Foundation, Capes, DFG SFB 689, DFG SFB 1170, ENB Topological Insulators, Awards2014 and Avvio alla Ricerca (Sapienza Università di Roma).